Sercel Inc.

Florent Guichard

Frédéric Nicolas

Oleg Valishin

Pierre Sagot

Christian Gregoire

Fabien Le Moine

Clément Visseaux

Sophie Lostanlen-Nouy

Jacques Thebaud

Gwenael Housin

Stéphane Molton

Thomas Girard

Freddy Excoffier

Stephane Molton

A communication system includes a node configured to collect ambient data with a sensor, and a docking station configured to couple to the node and to establish a communication path with the node through only one signal along one or two wires. The node includes a first module configured to use a first data communication protocol for receiving commands from the docking station along the communication path, and a second module configured to use a second data communication protocol for sending the ambient data to the docking station along the communication path. The first data communication protocol is different from the second data communication protocol, the first data communication protocol is asynchronous and the second data communication protocol is a modified synchronous protocol.

High-speed, half-duplex communication with standard microcontroller

A hybrid sensing apparatus for collecting data inside a well, the apparatus including an optical cable that acquires a first set of data; and an array of discrete probes connected to each other with an electrical cable. The discrete probes are configured to acquire a second set of data. The apparatus further includes an attachment system attached to the discrete probes and configured to hold the optical cable. The attachment system is configured to expose the optical cable to directly contact the well.

Hybrid sensing apparatus and method

A hybrid cable for collecting data inside a well includes an electrical cable extending along a longitudinal axis of the hybrid cable, an optical fiber extending along the longitudinal axis, an armor that extends along the longitudinal axis, and encircles the electrical cable and the optical fiber, and a connecting device extending along the longitudinal axis, to enclose the electrical cable and the optical fiber, and to be enclosed by the armor. The connecting device has an unsmooth external surface.

Hybrid cable with connecting device

A method for waking up a distant device from a local device, through a transmission medium and distant and local media converters. Initially, at least one of the physical and link layer units of the distant device is off, and its processing layer unit is off or in Low Power mode. The transceiver of the distant media converter is on. When receiving an initial wake-up signal from the local device, the transceiver of the distant media converter generates an electrical wake-up signal converted from the initial wake-up signal. The transceiver of the distant media converter sends the electrical wake-up signal, or derived wake-up information, to the processing layer unit of the distant device, through a transmission line independent of the physical and link layer units of the distant device. When receiving the electrical wake-up signal or the wake-up information, the processing layer unit of the distant device turns on.

Method for waking up a distant device from a local device without waking up a physical layer unit in the distant device

It is proposed a method for providing synchronization in a data acquisition system including a plurality of acquisition units. A given acquisition unit of the plurality carries out the following steps: receiving a packet from another device of the data acquisition system; extracting a synchronization accuracy information and a reference clock information from the received packet; obtaining a first reference clock as a function of the extracted reference clock information; if the extracted synchronization accuracy information indicates a better synchronization accuracy than a current synchronization accuracy information associated to the given acquisition unit: taking the obtained first reference clock as a selected reference clock and updating the current synchronization accuracy information to indicate a lower synchronization accuracy than the extracted synchronization accuracy information.

Method for providing synchronization in a data acquisition system

The invention relates to a device and a method, data acquisition device consisting of a wireless network comprising a first assembly of nodes, termed active nodes () of the network, and a second assembly of nodes, termed peripheral nodes () of the network, network for which one wishes to perform an access from peripheral nodes () to the network of active nodes (), characterized in that it comprises means for organizing in a perfectly controlled manner a routing of the data and/or commands within the network of active nodes () according to a first mode of transmission of data and/or of commands, and means for transmitting data between the peripheral nodes () and the active nodes () according to a second mode of transmission of data, said first mode of transmission of data and/or of commands and said second mode of transmission of data being temporally separated.

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Nantes, France

Florent Guichard